Stuffing-box.



J. F. KNORR & C. ANDRADE, JR.

STUFHNG BOX.

APPLICATION FILED JAN. 1. 1915.

1,153,933. PatentedSept. 21, 1915.

WITNESSES: v INVENTORS JACOB FRANK KNORR, 0F PATCI-IOGUE, AND CIPRIANO ANDRADE, JR., OF NEW YORK, N. Y.

STUFFING-BOX.

Specification of Letters Patent.

Patented Sept. 21, 1915.

Application filed January 7, 1915. Serial No. 1,059.

To all whom it may concern Be it known that we, J ACOB FRANK KNonR and CIPRIANO ANDRADE, J r., citizens of the United States, residing, respectively, at Patchogue, in the county of Suffolk and State of. New York, and at New York, in the county of New York and State of New York, have invented a new and useful Stuffing-Box, of which the following is a specification.

Our invention relates to improvements in stufling boxes, and more particularly to stufling boxes designed to be put at the sterns of boats propelled by propellers, and the objects of our invention are, 1st, to provide a form of stufling box which shall be less liable to leak than those now in use; 2nd, to provide a form of stufling box in which the lubrication will be effected directly by the action of the outside water without the necessity of oil; 3rd, to provide a form of stuping box in which the gland shall be threaded to the inside of the body of the stuffing box instead of to the outside of the body of the stuffing box; and ith, to provide a form of stuffing box in which the bore surface, when worn, may be readily removed and replaced. We attain these objects by the mechanism illustrated in the accompanying drawings, in which the figure is a longitudinal vertical section of said stufling box.

Similar letters refer to similar parts throughout the several views.

'A is the main body of the stuffing box with reinforcing webs B, flange C and boltholes D.

E are concentric circular corrugations on the back face of flange C, The function of these concentric corrugations is to create a number of circles of contact between the back face of flange C and the face of the shaft log or stern post adjacent thereto. As is well known, the face of the shaft log or stern post is of. wood, generally oak wood, which contains minute surface irregularities. If one of these irregularities occurs in .the line of one of the corrugations E it will permit water to escape past that particular corrugation, but such water will be stopped I at the next corrugation; and where several corrugations are employed as shown in the drawings it is extremely improbable that all of the surface irregularities in the wood will register exactly with the several corru gations E; and if even one of said corrugations is free from a defect in'the wood registering therewith, the result will be a tight oint.

F is a prolongation of main body A to fit nto the counter bore which is usually placed 111 the stern post or after end of the shaft 40g.

G is a circular shoulder at the end of F.

H is a circular hole through circular shoulder G.

J is a hollow cylinder fitting tightly within main body A. It will be noted that in practice J should be composed of lignum vitae wood or other substance which will lubricate against the bronze or steel of the shaft in the presence of the water in which the stufling box is immersed.

L is packing of square braided hemp, cotton wicking or other suitable material.

M is the gland with bore N and hexagon nut R.

P is a thread inside of main body A engaging thread Q on the outside of gland M.

S is a part of the face of the stern post or shaft log of the boat.

T is a gasket between flange 0 and stern post or shaft log S.

W are bolt holes in the stern post registering with holes D in flange C.

V is a lock nut with nut faces Z, said lock nut engaging on the thread Q of gland M.

The method of operation of our device is as follows: Our device is bolted to the after face of the stern post or shaft log according to the usual practice, the hanger bolts or lag screws going through holes D. It is preferable in practice to put a gasket T of felt, canvas or other suitable material between the face of flange C and the stern post S, and preferably white lead or other material will be placed on the gasket before bolting the stuffing box in place on the stern post or shaft log. When so set in place and tightly screwed into position, the corrugations E become a series of ridges of great pressure between flange C of the stuffing box and the face of the shaft log or stern post adjacent thereto, thereby making a joint of exceeding tightness and minimizing the chance of leakage.

In addition to the advantage above described, the anti-friction cylinder J insures a long wearing surface which, when worn,

Qri

can be readily removed by unscrewing gland M. A new anti-friction cylinder can then be put in place and the device can thus be used indefinitely without renewal of the main part of the stuffing box.

Another advantage of our stuffing box is that the gland M being threaded internally;

with reference to the main body A, does not project beyond the outer line of said main body A, and makes a much neater stufling box and one which offers far less resistance to the waterthan the stuffing box ordinarily in use.

It will be noted that it is of particular importance that the water just forward of the propeller should be disturbed as-little as possible, because in order to develop the utmost efliciency from the propeller it is necessary that the water reaching the propeller should be, so far as possible, solid and undisturbed. In the old forms of marine stufiing boxes, as, for example, the stufling box of Adams, Patent No. 994,709, of June 13th, 1911, the gland and lock nut are external to the main body of the stuffing box, with the result that the water rushing aft toward the propeller is torn and disturbed to a very material extent, and the efiiciency of the propeller thereby impaired. It will beobserved that in our device all surface irregularities of this nature are eliminated and the water has a smooth, undisturbed flow from the body of the stuffing box over the lock nut and gland t0 the propeller.

I Weclaiml. A stuffing box comprising a main body with a cylindrical bore and an interior thread at the front end of said bore; reinforcing webs; a flange with bolt holes and concentric corrugations on its back; an extension of the main body back from the flange; a shoulder at the back end of said extension; a removable hollow cylinder of anti-friction material tightly fitting within the main body and seating against the said shoulder;

a packing ring disposed against the front end of the hollow cylinder; a gland with an main body and seating against the said v shoulder; a packing ring disposed against the front end of the hollow cylinder; a gland; with an exterior thread fitting the interior thread above mentioned adapted to compress the said packing ring and external nut faces; and a lock nut disposed between the front end of the body and the nut portion of the gland.

J. FRANK KNORR. OIPRIANO ANDRADE, Jn.

TWitnesses: V

RALPH ATKINS, WVILLrAM Rnoxsrn, J r.

' Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. I 

